Two-Step Wireless Random Access Using Preamble-Data Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in reducing random access delay, signaling overhead, and device power consumption, particularly in scenarios like ultra-reliable low latency communication and unlicensed spectrum, where traditional four-step contention-based random access procedures are inefficient.
Innovation Solution
A two-step contention-based random access procedure is introduced, with a method for determining transmission message resources and mapping between preamble and data portions, including various structural designs and multiplexing methods to reduce resource conflicts and optimize latency and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional four-step contention-based random access procedure is used, then compatibility with existing systems is maintained, but random access delay is increased
Solution Approach 1:
The patent combines the preamble transmission and data transmission into a single message (Message A), eliminating the need for separate Message 1 and Message 3 transmissions. This merging of functions reduces the access procedure from four steps to two steps, directly reducing random access delay while maintaining system compatibility through the two-step structure.
2Loss of information
If traditional four-step random access procedure is used, then thorough communication is achieved, but signaling overhead is increased
Solution Approach 1:
The patent merges multiple signaling functions into Message A, which contains both the preamble (for random access request) and the data portion (for uplink data or control information). This consolidation eliminates redundant signaling messages, reducing overall signaling overhead while improving communication efficiency through the streamlined two-step procedure.
3Use of energy by moving object
If traditional four-step random access procedure is used, then complete access handshake is achieved, but device power consumption is increased
Solution Approach 1:
The patent combines the random access request and data transmission into a single Message A transmission, allowing devices to complete the access handshake in fewer steps. This reduces the number of times the device needs to transmit and receive signals, thereby reducing power consumption while maintaining access procedure completeness through the integrated message structure that includes both preamble and data portions.
4Device complexity
If preamble and data portions are transmitted separately, then resource allocation is simplified, but resource conflicts increase
Solution Approach 1:
The patent combines preamble and data portions into a single Message A that is transmitted in one go, eliminating the need for separate resource allocations for Message 1 and Message 3. This unified transmission approach reduces resource conflicts because the resources are allocated once for the entire message rather than separately for each component, simplifying resource management while reducing conflicts.
Data Source
Figure 1A~1B
Figure 2~5
Figure 6~7A
AI summary
A wireless communication technique includes generating, by a wireless terminal, a transmission message that includes a preamble portion and a data portion. In this technique, transmission resources for the data portion are related to transmission resources for the preamble portion using a relationship rule. The wireless terminal transmits the transmission message to a network-side device during a random access procedure.